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88 lines
2.0 KiB
88 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* crt0_s.S: Entry function for SPU-side context save. |
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* |
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* Copyright (C) 2005 IBM |
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* |
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* Entry function for SPU-side of the context save sequence. |
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* Saves all 128 GPRs, sets up an initial stack frame, then |
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* branches to 'main'. |
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*/ |
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#include <asm/spu_csa.h> |
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.data |
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.align 7 |
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.globl regs_spill |
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regs_spill: |
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.space SIZEOF_SPU_SPILL_REGS, 0x0 |
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.text |
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.global _start |
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_start: |
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/* SPU Context Save Step 1: Save the first 16 GPRs. */ |
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stqa $0, regs_spill + 0 |
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stqa $1, regs_spill + 16 |
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stqa $2, regs_spill + 32 |
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stqa $3, regs_spill + 48 |
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stqa $4, regs_spill + 64 |
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stqa $5, regs_spill + 80 |
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stqa $6, regs_spill + 96 |
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stqa $7, regs_spill + 112 |
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stqa $8, regs_spill + 128 |
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stqa $9, regs_spill + 144 |
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stqa $10, regs_spill + 160 |
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stqa $11, regs_spill + 176 |
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stqa $12, regs_spill + 192 |
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stqa $13, regs_spill + 208 |
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stqa $14, regs_spill + 224 |
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stqa $15, regs_spill + 240 |
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/* SPU Context Save, Step 8: Save the remaining 112 GPRs. */ |
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ila $3, regs_spill + 256 |
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save_regs: |
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lqr $4, save_reg_insts |
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save_reg_loop: |
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ai $4, $4, 4 |
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.balignl 16, 0x40200000 |
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save_reg_insts: /* must be quad-word aligned. */ |
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stqd $16, 0($3) |
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stqd $17, 16($3) |
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stqd $18, 32($3) |
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stqd $19, 48($3) |
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andi $5, $4, 0x7F |
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stqr $4, save_reg_insts |
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ai $3, $3, 64 |
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brnz $5, save_reg_loop |
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/* Initialize the stack pointer to point to 16368 |
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* (16kb-16). The back chain pointer is initialized |
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* to NULL. |
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*/ |
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il $0, 0 |
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il $SP, 16368 |
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stqd $0, 0($SP) |
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/* Allocate a minimum stack frame for the called main. |
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* This is needed so that main has a place to save the |
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* link register when it calls another function. |
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*/ |
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stqd $SP, -160($SP) |
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ai $SP, $SP, -160 |
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/* Call the program's main function. */ |
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brsl $0, main |
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/* In this case main should not return; if it does |
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* there has been an error in the sequence. Execute |
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* stop-and-signal with code=0. |
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*/ |
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.global exit |
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.global _exit |
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exit: |
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_exit: |
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stop 0x0 |
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/* Pad the size of this crt0.o to be multiple of 16 bytes. */ |
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.balignl 16, 0x0 |
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